Broken Airflow meter anyone?

genesisGT · Post by **genesisGT** » Mon Nov 15, 2004 9:49 pm

Hi folks,
has anyone got a old/buggered/broken airflow meter for a GT or NZ polo which would be going cheap? As i want one to take the guts out it, and mod it for a little experement am doing on my polo.

Cheers richard.

optima21 · Post by **optima21** » Tue Nov 16, 2004 12:38 am

nooo, but Im intrigued to know what you're doing with an AFM, as I've been playing with them in the past.

genesisGT · Post by **genesisGT** » Wed Nov 17, 2004 11:41 am

My AAU engine polo has a home made cold air feed fitted just now. Basically a GT grill air Duct (the bit that turns 90 degrees just after the air enters) and a flexi pipe which then joins the basic trumper arangement on the single point airbox. It works fine but a fancied tinkering about so:

The basic idea is im board and thought why not try to fit my spare GT air box system on to my 1043cc AAU engine instead of the basic induction kit everyone else does. (like to be different sometimes). So a have all the bits a think.

The system will be standard gt from the grill back to the airflow meter. Am using a single point injection passat air box on top of the injector unit, and a cut GT flexi hose between the air box and airflow meter. The passat box has the temp switch to control the hot/cold air flap and has a attachment for the oil breather pipe so thats all sorted. The only thing is my ECU has nothing to control/take readings from the airflow meter.

As far as i can make out the airflow meter basically has two (at the most) variable resistors which only send info to the ECU however the wee flap that moves inside causes a air flow restriction so i wish to dismantle a airflox meter and basically remove that flap and just use the air flow meter as a pipe adaptor - from a square hole in the airbox to a large circular connector for the Gt rubber pipe leading to the airbox. If any of that made any sence!

Or would the car run fine with a standard airflow meter in place but just not connected up. Im not sure whether the suction effect would be enough to move the flap sufficiently or whether it would restrict air flow.

Thats the basic idea - no idea whether it will work or if my car will end up loosing power but am going to give it a shot.

last resort is - remove the GT box and wedge a big K&N up the end of the passat pipe and have the same as everyone else.

mad idea but a do things like that.

essay over!

optima21 · Post by **optima21** » Wed Nov 17, 2004 12:33 pm

yeah I understand what you're saying, and the GT airflow meter will provide some reistance, but the spring that controls the flap can be removed.

if you're using the airbox lid off a GT, I'd just bolt a plate to where the airflow meter was and drill a hole in the top and add connect your induction hose there.

on the 1L's the main difference that the induction kits make is just more noise, but I did some testing a coupld of weeks ago on the GT airbox, without the angle that goes behind the grill and found that they are restrictive at high revs.

genesisGT · Post by **genesisGT** » Wed Nov 17, 2004 4:28 pm

Thanks optima21 - How do you remove the spring as a have felt its resistance and a dont think its that strong, I understand what you are saying about the Right angle on the back of the grill as air flow likes as gradual bends as possible to keep the air flow/pressure etc.

If a dont get a meter to gut a have a good spare one. current options (2) include -
remove the spring and let the flap flap about - might cause hick ups when accelerating as it bounces?

Or

make a square tube out of something cheap/light/easy to work with (galvansied tin) and open the flap to its maximum airflow and push the pipe down to wedge it in this position and then just bend the ends to stop it moving etc. (obviously a will make cut outs for the sensor nearest the air box etc so a dont trash the meter/sensor. only thing is the spring will get nackered being streatched all the time.

Du!

just worked out what to do - remove spring and fit square tube no problems.

Anyone know how to remove the spring?

Cheers Richard

optima21 · Post by **optima21** » Wed Nov 17, 2004 5:02 pm

its easy enough to do, just prise off the top of the AFM (the black bit) with a screwdriver, and you should see something like this :-

then you undo the wire arm thats on top of the spindle and remove it

then I cant remeber what to do, but I think you just take the spring out

genesisGT · Post by **genesisGT** » Wed Nov 17, 2004 5:13 pm

cheers! photos and all am very impressed!

A will send you a photo when its finnished and a brief description of if it works.
Thanks Again! bye.